Is there an example of setting the language to es-ES when calling mrcp through the Avaya Media Server. I have put es-ES in locale but still see it calling en-US to the MRCP server.

Your question is of a nature that will require a higher level of support than is provided through the forums.

Please open a support ticket against the proper product and interface by opening a Devconnect technical support ticket by going to the DevConnect Portal page, and following the links through "Support & Forums" -> :Submit Support Ticket" -> "Technical Support"

If you do not see the appropriate product/interface pair, then support for the interface you are using is not available at your membership level, or it is not provided through the DevConnect program. Not all product interfaces have support options available through the DevConnect program.